It would be interesting if some of the seat-savers would weigh in on this, wouldn't it? So far, I haven't seen any comments by any of them.
On another note, if we choose to sit in a "saved, reserved, whatever the verbage seat", what can the saver to about it other than yell? If someone gets physical, could charges not be filed against them? I would think so.
When we went to SS on Oktoberfest, some guy put some chairs in front of the front row that someone had established. Needless to say, when told by those he got in front of that he couldn't do that, he told them "that until someone with the authority to do so tells me I can't, then I'm sitting here"....and he did. (BTW, you could look across the "aisle" and his chairs were actually in line.)
